EP 0505504 B1 19970305 - BIOSENSOR ELECTRODE EXCITATION CIRCUIT
Title (en)
BIOSENSOR ELECTRODE EXCITATION CIRCUIT
Title (de)
ERREGERKREIS FÜR BIOSONDENELEKTRODEN
Title (fr)
CIRCUIT EXCITATEUR D'ELECTRODES DE BIOCAPTEURS
Publication
Application
Priority
- US 9007501 W 19901214
- US 45110889 A 19891215
Abstract (en)
[origin: US4999582A] A circuit is described for applying a potential to an electrode of a biosensing test cell, which electrode, when properly inserted in a female connector, is contacted by a pair spaced apart contacts. The circuit includes a source of excitation potential and an operational amplifier having one input connected to the source of excitation potential. A switching circuit is coupled between the operational amplifier and a first one of the spaced apart contacts, with the switch means exhibiting an impedance. A feedback circuit is connected between the second of the spaced-apart contacts and another input to the operational amplifier, to feed back a potential appearing at the second contact. The feedback is for the purpose of maintaining the output of the operational amplifier at a level which compensates for impedance losses in the swtiching circuit. The feedback circuit enables the output of the operational amplifier to be varied so that the potential applied to the electrode is equal to the source of excitation potential. A further circuit is connected to the feedback circuit for sensing when an open or high impedance state exists between the spaced-apart contacts.
IPC 1-7
IPC 8 full level
G01N 27/416 (2006.01); G01N 27/327 (2006.01); G01N 33/487 (2006.01); G01R 27/02 (2006.01)
CPC (source: EP US)
G01N 27/3273 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
US 4999582 A 19910312; AT E149690 T1 19970315; CA 2068214 A1 19910616; CA 2068214 C 19981201; DE 69030104 D1 19970410; DE 69030104 T2 19970925; EP 0505504 A1 19920930; EP 0505504 A4 19930804; EP 0505504 B1 19970305; ES 2100944 T3 19970701; JP 2708276 B2 19980204; JP H05503158 A 19930527; WO 9109316 A1 19910627
DOCDB simple family (application)
US 45110889 A 19891215; AT 91903964 T 19901214; CA 2068214 A 19901214; DE 69030104 T 19901214; EP 91903964 A 19901214; ES 91903964 T 19901214; JP 50409691 A 19901214; US 9007501 W 19901214